Malicious PDF — malware analysis report

Static analysis result for SHA-256 37e66980de05b85f…

MALICIOUS

PDF

88.2 KB Created: 2021-09-05 00:47:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 943d965bd62d16efe24c02b7fe34a1c3 SHA-1: dfdd51f0f18c33d5a2958fea220d5edf1f0614e7 SHA-256: 37e66980de05b85fc64ba930358336efa598f1e34f2d6128f1999db664698810
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://noddy.nu/images/file/woraxunar.pdf In PDF document text
    • http://sevvalturizm.com/rsm/files/toketivo.pdfIn PDF document text
    • http://solarexperte.ch/fckeditor/editor/images/file/41769986818.pdfIn PDF document text
    • http://business-plan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/piragetipodun.pdfIn PDF document text
    • http://hoangnamjsc.com/upload/files/23179648384.pdfIn PDF document text
    • https://goodline.by/userfiles/file/19888442341.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/6caa5b5bd5db6ecad60ee7979aec6af6/surikuzizimufogekidikuraz.pdfIn PDF document text
    • http://iworking.vn/uploads/files/89936955757.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/kegapo.pdfIn PDF document text
    • https://maintogelonline.info/contents//files/najijuwipuxexasid.pdfIn PDF document text
    • http://dzstock.com/Upfiles/file/56427028620.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/46294451814.pdfIn PDF document text
    • http://1-cx.com/ckfinder/userfiles/files/78817680558.pdfIn PDF document text
    • http://gyobel.itpublic/file/gosakilumanati.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/78690473881.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/ff2de986a36add47f9e4308297c05746/farokulutun.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/98305426752.pdfIn PDF document text
    • http://accomplishtheimpossible.com/userfiles_ati/file/jarodatobitob.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/29320813269.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160f363ee05153---27078892837.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/95472631572.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/banujemafa.pdfIn PDF document text
    • https://xetnghiemadndanang.com/upload/userfiles/files/nijixex.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/pfoi4nbi5221kgn16q6k8esj52/bibuxakitex.pdfIn PDF document text
    • https://stopserv.ru/files/file/rabezugepu.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/58069813949.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=shipping+container+construction+details+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f29d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29D 11072 bytes
SHA-256: 3f6aeb49f7c11cf0b469e4f980772311a1b8ec74ea2240c62d9596991eac5d81
font_01_sfnt_off00010c27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C27 18000 bytes
SHA-256: 4af1b0103b0e5fd96d6fc86e457e7781fb01c5536ab39ea80fa50a07ad5b0f07
font_02_sfnt_off00013abe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ABE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1